option = {
  xAxis: {
    type: 'category',
    data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
  },
  yAxis: {
    type: 'value'
  },
  series: [
    {
      data: [150, 230, 224, 218, 135, 147, 260],
      name: 'xx1',
    },
    {
      name: 'xx',
      data: [150, 230, 224, 218, 135, 147, 260],
    }
  ]
};

[{
  name: xx,
  value: xx
}, {
  name: xx,
  value: ''
}]